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So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
GASES OF THE AIR. The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller. amounts of water vapor, argon, and carbon dioxide, and very small amounts of other gases. Air also contains. suspended dust, spores, and bacteria.